1. Open iTunes (make sure it's v8.2) and connect your iPhone/iPod Touch.
2. Select iPhone/iPod Touch under 'Devices' on the left.
3. If you're using Windows: Hold down the 'shift' key, and click on the restore button. If you're using a Mac: Hold down the 'option' key, and click on the restore button.
4. iTunes will pop up with a window which will let you browse for the .ipsw firmware file you want to install.
5. Wait while the OS 3.0.1 firmware is being installed.
iPhone OS 3.0.1 iPhone 3G OS 3.0.1 iPhone 3G[S] OS 3.0.1
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